Screening apparatus.



W. D. RICHARDSON.

SCREENING APPARATUS.

APPLICATION FILI-:D IuIIE Io. Isle.

L. Panted 004.. 22, 1918.

3 SHEETS-SHEET Howie/Ig W. D. RICHARDSON.

SCREENING APPARATUS.

APPLICATION FILED IuIIE I0, IsIs.

' LQST. Patent-ed .Oct 22, M918.

3 SHEETS-SHEET 2.

I. D. RICHARDSON.

SCREENING APPARATUS.

APPLICATION FILED JUNE IO, 191. Elggfin Paented 0st. 22, 1918.

' 3 SHEETS-SHEET a.

WKLLABDD. RICHARDSON, 0F HEERDE, NORTH SCREENING APPATUS.

Bpeoiicatlon'of Letters Estant.

Patenten not. ea, este.

Application led June lo, 1916. Serial No.' 102,81?.

' To all wsom it ma concern.'

Be it @own t at I, Winnaar D. Bron- AnnsoN, a citizen of the UnitedStates vof America, residing at Hebron, in the county oi Morton andState of North Dakota, have invented certain new and useful Improvementsin Screening Apparatus, of which the following is a specification. A

My invention relates to screening appa# ratus and has to do particularlywlth t at class of screening or separating machine composed of cloth andstretched and fastened upon steel frames and' in which the screen isjarred and vibrated by percussive action or impact upon the reinforcedscreen cloth or frame. My aim is to rovide mechanism which is readilyaccessi le for cleaning and repairing and which, at the same time, iscapable of performing all of the steps of screening eiiciently and witha minimum number of elements.

One ofthe important features of my invention arises from the fact that lutilize, in combination with one or more fine meshed screens, a scalpingscreen whichprotects the fine meshed screens from the coarser particlesof the material; is of such nature and so disposed that the line meshedscreens are readily accessible, and which renders an independentconveyer element unnecessary. Frequent cleaning is necessary in screensof this type', particularly in cold weather when plasticmaterials arebeing operated upon and my screen structure is peculiarly desirable inthat the scalping screen does not interfere withdirect access to thefiner screens.

Another important feature of my invention'resides in the fact that myfeeding and scalping screen is so located and supplemented that it maydistribute the partially screened material to both sides or either sideof a central line, which central line forms the apex of adjacentdownwardly inclined screens. The regulating mechanism comprising a partof my invention makes possible the regulable control of the amount ofmaterial to be fed to either of these screens and may be so adjustedthat one screen only is operated, it being understood that one of thesedownwardl inclined screens may be entirely dispense with.

One of the important features of my invention has to do with a novelvibrating mechanism for the inclined screen structure,

whether this inclined screen structure comprises a single screen ormultiple superposed screens. This peculiar vibrating mechanism is simpleand eective in that it delivers series of light rapid blows upon theupper sides of the screens, giving the intense vibration of the screencloth required for large capacity and to prevent clogging of the meshscalping screen l decreasing in diameter from the right to left of Fig.1 and designed to be fed from left, being turned by a pulley 2. As shownbest in Fig. 2, the rotatable scalping screen is mounted at the apex ofa pyramidv formed by two screen members 3 and 4 which incline downwardlyand outwardly from the said scalping screen and which are designed to befed thereby. The scalping screen is preferably located within ahopperlike structure 5' having a funnel chute 6 and a central gate 7adjustable to varying positions as indicated in Fig. 2 and provided withmeans for locking in adjusted position. This means may take the form ofan arcuate slot 8 from which a threaded pin 9 extends for the receptionof a clamping nut 10.

The screenelements 3 and 4 may be of duplicate structure and eachcomprises a sharply inclined chute 11, a comparatively fine screen 12and atop cover 13. For successful screening with a screen of this type,

it is necessary that any vibrating action result initially from blowsapplied to the upper side of the screen. Prior dev1ces have accomplishedthis but the vibrator elements used have been mounted upon the cover ofthe screening elements and have produced certain material drawbackswhich are obviated by my invention.

The particular form of vibrating mechanism used by meis illustrated inFig. 2 and,

is shown best in Fig. 8 and comprises an vac inner pipe'll bilurcated atits lower end tor the reception or a roller i8. llt will be understoodthat this pipe may be replaced by a solid rod but that in the presentinstance it is formed of a lower part and an'upper part connected by thesleeve yi9 into which they are passed. rlhe upper part is held in placeby va set screw while the lower part is threadirom y, rotating by a set,

ed and prevented screw 2l. rllhe pi e or rod i7 entends upwardlythroughl tlie bottom oi chute, the screen, and the cover oi thescreening elenient and carries a hammering head 22 which is in theforni` oi an annulus threaded onto the pipe 23/ and having its upperedge rounded as at 2d. By loosening the upper :set screw 2O the uppersection or the pipe' with hammer can be lifted out when necessary..

'lhe sleeve 19 is formed at its upper end with an lfshaped 'hangsstructure 25 within which rests a coil spring 26 designed to bear at itsupper end against the rein-foraines4 structure 27 connected to thebottom ll or the chute. @n the upper surface or this botn tom, there isa socket structure 28 into which the pipe casing 29 is threaded. 'lhissleeve or pipe casin.' 29 concentrically surrounds the pipe or ro i7 andhas a collar 30 adgustahly threaded upon its upper endv wlor the supportof a coil spring 3l whose upper end in turn bears against the screen l2.

@n the upper surface or the screen l2 is a second soclret 33 whichreceives the pipe 32. This pipe has a collar 35 threaded upon its upperend havinoan il..shaped flange structure 36 containing a wooden anvilblock 37. rthis liz-shaped flange structure rounded at its surface topermit raising or f lowering oi the cover 13 without interi-lerence,this cover i3 being provided with opertures 38 Jfor each vibrator.

ln operation, material to be screened is fed into the smaller end or therevolving screen and the rotation of this revolving screen together withits gradually increasing diameter serves to leed and screen the materialuntil its relatively hner articles pass to the supplemental screen eements while its coarser particles are delivered troni its larger end inany suitable manner. rlhe material which is passingto the screeningelements 3 and i is divided as desired by adjustment oit the gate 7 andalter passing troni such gatetalls yonto the screen 12 over which it e,dmutates. The hner particles separated hy the screen l2 drop to thebottom of chute l1 while the tailings are delivered at the lower end oithe screen. rEhe gravitation or this material is accelerated by ,theaction or the vibrators, which serve to prevent the screens from clogginThese vibrators are continuously actuate by their cams against thetension oi their springs 26 and 31. The result 1s that both the bottomll and the screens 12 are vibrated through downwardly directed blows ofthe head pieces or hammers 22 upon the anvils 37. At the same timethecover 13 isunencumbered and may be lifted with great ease tor cleanin oithe screening elements which, in col weather may be required once a dayor oitener when operating onfclay or other plastic material. It will beunderstood that other screens may bc utilized in addition to the screenl2 and that my improvement will still be applicable thereto. lt willalso be understood that only one ot the screenmg elements need be usedand that the other screening element may be removed or may bedisconnected by the gate 'Z'.

@ne of the important eaturesof my invention is illustrated by areference to that type or machine wherein superposed scalpnip; and huescreens are fed by a rotating screw. My device is en improvement uponthis in the sense that it accomplishes hyl two elements what the otherdevice accomplishes by'three. The rotating screen in question 10o notonly serves to :leed the material but has a screening action upon itequivalent to the screening action 'oil the normal scalping screen and,furthermore, the material being fed has no chance to ehehe up therotating 105 screen because or its constant presentation otnew surfacesand an inversion or the old.

Summarizing, it may be stated that l have provided a screening machinewherein the material to be screened is delivered to a rolletatable'sc'alping screen. rllhe material passes in. one end oi: thisscreen and the coarser particles thereota are delivered from the otherend, this being brought about by the gravitation et the material fromthe smaller end to 115 the larger end ol the screen. The result is thatthe scalping screen serves very ederatually as a ieedin "device and is;nevertheless, in such a position that the ner screens o-E the machineare' readily accessible lor 120 cleaning. lt will be noted that mydevice is such that'each rotatable scalping screen feeds a plurality olscreens, this feeding action being1 regulated by a ate valve. ln

addition, the vibrating mec anism is such 125 that the liner screens aresubjected to a series of percussive blows upon their upper surfaceswhile the operating mechanism for. these vibrators is below thescreeningI machine,

leaving the cover or the screening machine ist) unencumbered by weightyparts. These are some of the principal features of my invention andthey, in conjunction with other features, will be vset forth in theappended claims.

Having thus described my invention, what l claim is:

1. Screening apparatus comprising a screen, means for percussivelyvibrating said screen by blows upon the upper surface thereof, andmechanisms for operating said means by apparatus beneath said screen.

2. Screening apparatus comprising a screen, a cover for said screen,means for percussively vibrating said screen by blows upon its uppersurface, a mechanism for operating said vibrating means, said coverbeing independently mounted.

3. Screening apparatus comprising a chute, a screen in said chute, acover for said chute, percussive vibrators for hammering said screenfrom above, said cover being capable of elevation without saidvibrators.

4. In screening apparatus, a chute, a screen, mechanisms for impartingvibrating movements to the wire-cloth screen by vlight rapid impactblows upon the upper side of the screen, and means underneath the bottomof the fines chute for operating said mechanism.

5. n screening apparatus, a chute, a

screen, and a cover for said chute, multiple rods .having caps on theirupper ends and extending through the chute, screen and cover, anvilsconnected to said screen and chute for transmission of hammer blowsfroinsaid caps, and means for rapidly reciprocating said rods. 6. lnscreening apparatus, a screen, multiple rods extending through saidscreen, hammer caps on said rods, and operating cams contacting withlower end of said rods, an anvil element connected to said screens toreceive and transmit successive blows from said hammer caps.

7. l'n screening apparatus, a screen, multiple hammer rods extendingthrough said ,aar

screens, hammer caps on said rods, a socket coupling on lower end ofeach of said rods, a coil spring around each rod and supported in eachsocket of each coupling, a short rod extending below said coupling, aroller upon the lower end of each short rod, and rotating camscooperating with said rollers to successively lift and drop said rods,the movement of the rods compressing the springs, the release of whichhelps to bring the rod back to its normal position.

8. In screening apparatus, a chute, a screen, a cover, rods with caps ontheir upper ends and extending through the cover chute and screen of theapparatus, a cou- -pling on the lower end of each rod, said couplingshaving sockets for the reception of coil springs, coil springs embracingsaid rods and resting in said coupling sockets, said coil springspressing against the under side of said chute, a short rod extendinginto said coupling and connected thereby to said first rod, rotatingcams operative to lift said rods aga-inst said coil springs, pipecasings around said rods in two sections, the upper section of thebottom secured to the upper side of the screen, said upper sectionhaving an annulus filled with wood to serve as an anvil, the lowersection of said pipe asing being fastened at its lower end to the upperside of the chute, an annulus upon the upper end of said lower sectionand forming a spring socket, a spring in said last socket coiled aroundthe casing and pressing at its upper end against the bottom side of saidscreen, the movement of the spring under the impact blows of the hammeron the anvil connected to the screen by the casing serving to acceleratethe vibration of the screen.

In testimony whereof hereby afiix'my signature.

- wiLLAan D'. RICHARDSON.

Witnesses:

FERDINAND H. BINGENHEIMER, R. P. Garner.

